{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T08:45:59.105Z","years_from_j2000":26.683,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-141004-b","name":"HD 141004 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":38.5347237144778,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":236.6099205,"dec_deg":7.3527684,"epoch_ra_deg":236.938279,"epoch_dec_deg":7.268885,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 141004","semi_major_axis_km":18520216.392659996,"periapsis_km":null,"mass_kg":8.142954532777166e+25,"mass_msun":0.0000409521,"constellation":"Serpens","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-141004-b","radius_km":24045.437,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 141004","host_v_mag":4.4154,"eccentricity":0.16,"uncertainties":{"mass_kg":[8.731373145742146e+24,8.731373145742146e+24],"distance_ly":[0.1170901396003109,0.11774245235574438],"eccentricity":[0.1,0.11],"host_mass_solar":[0.051084,0.051084],"host_radius_solar":[0.032635,0.032635],"host_temperature_k":[94.35,94.35],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.0018,0.0016],"argument_of_periastron_deg":[42.3989,31.5127]},"host_mass_solar":1.051904,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.389372,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"G0Vvar","host_temperature_k":5885.38,"orbital_period_days":15.5083,"transit_midpoint_bjd":2456704.33,"equilibrium_temperature_k":950.73,"argument_of_periastron_deg":19.4806},"designations":[{"catalog":"Exoplanet","designation":"HD 141004 b"},{"catalog":"Host star","designation":"HD 141004"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}